7274d2d186
Current tracked changes include bounds, visibility, and "existence". bounds and visibility are fairly straightforward, call collect() before doing operations and it will record the state. Once the transition is finished, it will compare that recorded state with the finished state. "existence" is more complicated. It's the difference between show/hide vs open/close. Because Task instances are basically always around, their existence depends on the circumstances around when/how activities are started. For that we have to explicitly indicate when a container is going to change its existence via collectExistenceChange(). Bug: 169035306 Test: atest TransitionTests Change-Id: I78d4cda6b726202507b757f93c742d49e51e2d7b